Foldable Mobile Terminal, Foldable Mechanism for Foldable Mobile Terminal, and Foldable Unit for Foldable Mobile Terminal

ABSTRACT

The foldable mobile terminal includes: a flexible display screen; a first shell and a second shell, the flexible display screen being provided on the first shell and the second shell; and a foldable mechanism including a first rotation assembly connected to the first shell and a second rotation assembly connected to the second shell. The first and second rotation assemblies both comprise sliding plates, rotation shafts, and connection rods. The sliding plates are at least partially received in the shells, and can extend or retract with respect to the shells in a sliding manner. First ends of the connection rods are slidably and hingedly connected to the rotating shafts, and second ends are rotatably connected to the shells.

CROSS-REFERENCE TO RELATED APPLICATION(S)

The present application is a continuation application of International(PCT) Patent Application No. PCT/CN2018/086582, filed on May 11, 2018,which claims foreign priorities to Chinese Patent Application No.201710349824.3, filed on May 17, 2017, and Chinese Patent ApplicationNo. 201720552264.7, filed on May 17, 2017, the entire contents of all ofwhich are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of electronic devices, andin particular to a foldable mobile terminal, a foldable mechanism for afoldable mobile terminal, and a foldable unit for a foldable mobileterminal.

BACKGROUND

A flexible display screen may have a property of being foldable.Therefore, a smart mobile terminal, such as a smart phone, which carriesa flexible display screen may be switched between a folded state and anunfolded state. When the mobile terminal is in the unfolded state, alength of a side of the mobile terminal facing towards a user may beequal to a length of another side of the mobile terminal facing awayfrom the user. However, when the mobile terminal is in the folded state,the two sides of the mobile terminal which have an equal length whilethe mobile terminal is unfolded may have different lengths because of athickness of the mobile terminal. Therefore, the mobile terminal needsto adapt to a change of the length of the two sides in different states.

SUMMARY

A foldable mobile terminal may include: a flexible display screen; ashell assembly, comprising a first shell and a second shell, wherein theflexible display screen is arranged on the first shell and the secondshell; and a foldable mechanism, including a first rotation assemblyconnected to the first shell and a second rotation assembly connected tothe second shell. The first rotation assembly may include a firstsliding plate, a first rotation shaft, and a first connection rod. Thefirst sliding plate may be at least partially received in the firstshell and is able to slide towards and away from the first shell. Thefirst rotation shaft may be arranged on the first sliding plate. A firstend of the first connection rod may be slidably hinged to the firstrotation shaft, and a second end of the first connection rod may berotatably connected to the first shell. The second rotation assembly mayinclude a second sliding plate, a second rotation shaft, and a secondconnection rod. The second sliding plate may be at least partiallyreceived in the second shell and slide towards and away from the secondshell. The second rotation shaft may be arranged on the second slidingplate. A first end of the second sliding plate may be slidably hinged tothe second rotation shaft, and a second end of the second sliding platemay be rotatably connected to the second shell.

A foldable mechanism for a foldable mobile terminal may further beprovided. The foldable mobile terminal may include a first shell and asecond shell connected to each other. The foldable mechanism may includea first rotation assembly capable of being connected to the first shelland a second rotation assembly capable of being connected to the secondshell. The first rotation assembly may include: a first sliding plate,capable of being at least partially received in the first shell and ableto slide towards or away from the first shell; a first rotation shaft,arranged on the first sliding plate; and a first connection rod, whereina first end of the first connection rod is slidably hinged to the firstrotation shaft, and a second end of the first connection rod is capableof being rotatably connected to the first shell. The second rotationassembly may include: a second sliding plate, capable of being at leastpartially received in the second shell and able to slide towards or awayfrom the second shell; a second rotation shaft, arranged on the secondsliding plate; and a second connection rod, wherein a first end of thesecond connection rod is slidably hinged to the second rotation shaft,and a second end of the second connection rod is capable of beingrotatably connected to the second shell.

A foldable unit for a foldable mobile terminal may further be providedand include: a first case, a second case, and a foldable mechanism. Thefirst case may have a first chamber, and the second case may have asecond chamber. The foldable mechanism may be connected to the firstcase and the second case and include: a first substrate, at leastpartially received in the first chamber and able to slide towards oraway from the first case; a first rotation shaft, capable of beingarranged on the first substrate; a first connection rod, wherein a firstend of the first connection rod is slidably hinged to the first rotationshaft, and a second end of the first connection rod is rotatablyconnected to the first case; a second substrate, at least partiallyreceived in the second chamber and able to slide towards or away fromthe second case; a second rotation shaft, capable of being arranged onthe second substrate; and a second connection rod, wherein a first endof the second connection rod is slidably hinged to the second rotationshaft, and a second end of the second connection rod is rotatablyconnected to the second case.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a foldable mobile terminal in anunfolded state according to some embodiments of the present disclosure.

FIG. 2 is an exploded perspective view of the foldable mobile terminalshown in FIG. 1.

FIG. 3 is an exploded perspective view of the foldable mobile terminalshown in FIG. 1, but shown from a different aspect.

FIG. 4 is a perspective view of a foldable mechanism in a foldablemobile terminal in an unfolded state according to some embodiments ofthe present disclosure.

FIG. 5 is a front view of the foldable mechanism shown in FIG. 4.

FIG. 6 is a perspective view of the foldable mechanism of FIG. 4 withportions omitted.

FIG. 7 is an exploded perspective view of the foldable mechanism of FIG.4.

FIG. 8 is an exploded perspective view further illustrating a partialstructure of FIG. 7.

FIG. 9 is an exploded perspective view of a partial structure of FIG. 7,but shown from a different aspect.

FIG. 10 is a perspective view of a foldable mobile terminal with aflexible display screen omitted according to some embodiments of thepresent disclosure.

FIG. 11 is a front view of a partial structure shown in FIG. 10.

FIG. 12 is a cross sectional view taken along a line A-A of FIG. 11.

FIG. 13 is a cross sectional view from a back of the structure shown inFIG. 10.

FIG. 14 is a schematic view of the structure shown in FIG. 11 with someelements of the foldable mechanism omitted.

FIG. 15 is a back view of the structure shown in FIG. 14.

FIG. 16 is view of an elastic sheet of a foldable mechanism.

FIG. 17 is a perspective view of a first decoration component or asecond decoration component.

FIG. 18 is a perspective view of the first decoration component or thesecond decoration component, but shown from a different aspect.

FIG. 19 is a perspective view of a foldable mobile terminal in a foldedstate according to some embodiments of the present disclosure.

FIG. 20 is a perspective view of the foldable mobile terminal shown inFIG. 19 with a flexible display screen omitted.

FIG. 21 a perspective view of the foldable mobile terminal shown in FIG.4 in an unfolded state.

FIG. 22 is a front view of the foldable mechanism shown in FIG. 21.

FIG. 23 is a sectional view of a partial structure of a foldable mobileterminal in an unfolded state according to some embodiments of thepresent disclosure.

FIG. 24 is a sectional view of a partial structure of a foldable mobileterminal in a semi-folded (or a semi-unfolded) state according to someembodiments of the present disclosure.

FIG. 25 is a sectional view of a partial structure of a foldable mobileterminal in a folded state according to some embodiments of the presentdisclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the presentdisclosure, examples of which are illustrated in the accompanyingdrawings, in which the same or similar reference numbers throughout thedrawings represent the same or similar elements or elements having sameor similar functions. Embodiments described below with reference todrawings are merely examples and used for explaining the presentdisclosure, and should not be understood as limitation to the presentdisclosure.

The directional terms used here are only for better and more clearlydescribing and understanding the present disclosure, and are notintended to indicate or imply that the devices or the elements aredisposed to locate at the specific directions or are structured andperformed in the specific directions, which could not to be understoodas limiting the present disclosure. In addition, terms such as “first”,“second”, and the like are used herein for purposes of description, andare not intended to indicate or imply relative importance orsignificance or to imply the number of indicated technical features.Thus, the feature defined with “first”, “second”, and the like mayinclude one or more of such a feature. In the present disclosure, aplurality may indicate two or more, unless specified otherwise.

The mobile terminal provided in the present disclosure may include, butnot be limited to, a device receiving/transmitting communication signalsby wired connection (such as a public switched telephone network (PSTN),a digital subscriber line (DSL), a digital cable, a direct cableconnection, and/or another data connection/network), and/or by awireless interface (such as a wireless interface of a cellular network,a wireless local area network (WLAN), a digital television network suchas a DVB-H network, a satellite network, an AM-FM broadcast transmitter,and/or another communication terminal). A communication terminalconfigured to communicate by a wireless interface may be referred as a“wireless communication terminal”, a “wireless terminal”, and/or a“mobile terminal”. The mobile terminal of the present disclosure mayinclude, but may be not limited to a satellite or cellularradiotelephone telephone, a terminal of personal communications system(PCS) that may combine cellular radiotelephone with data processing,fax, and data communication capabilities, a personal digital assistant(PDA) equipped with a radiotelephone, a pager, an internet/intranetaccess, a web browser, a notepad, a calendar, and/or a globalpositioning system (GPS) receiver, a conventional laptop and/or a palmreceiver, other electronic device including a radiotelephone transceiverand the like.

According to an aspect of the present disclosure, a foldable mobileterminal may be provided and include: a flexible display screen; a shellassembly, comprising a first shell and a second shell, wherein theflexible display screen is arranged on the first shell and the secondshell; and a foldable mechanism, including a first rotation assemblyconnected to the first shell and a second rotation assembly connected tothe second shell. The first rotation assembly may include a firstsliding plate, a first rotation shaft, and a first connection rod. Thefirst sliding plate may be at least partially received in the firstshell and is able to slide towards and away from the first shell. Thefirst rotation shaft may be arranged on the first sliding plate. A firstend of the first connection rod may be slidably hinged to the firstrotation shaft, and a second end of the first connection rod may berotatably connected to the first shell. The second rotation assembly mayinclude a second sliding plate, a second rotation shaft, and a secondconnection rod. The second sliding plate may be at least partiallyreceived in the second shell and slide towards and away from the secondshell. The second rotation shaft may be arranged on the second slidingplate. A first end of the second sliding plate may be slidably hinged tothe second rotation shaft, and a second end of the second sliding platemay be rotatably connected to the second shell.

In some embodiments, the foldable mechanism further includes a linkageelement connected to the first rotation shaft and the second rotationshaft. The linkage element has a first through hole and a second throughhole. The first rotation shaft is arranged to extend through the firstthrough hole, and the second rotation shaft is arranged to extendthrough the second through hole.

In some embodiments, the foldable mobile terminal may further include afirst roller and a first spring. The first sliding plate has a firstgroove; the first spring and the first roller abut against both thefirst shell and the first sliding plate. When the first sliding plateslides towards or away from the first shell, the first roller is able tomove into or out of the first groove.

In some embodiments, the foldable mobile terminal may further include asecond roller and a second spring. The second sliding plate has a secondgroove; the second spring and the second roller abut against both thesecond shell and the second sliding plate. When the second sliding plateslides towards or away from the second shell, the second roller is ableto move into or out of the second groove.

In some embodiments, the first rotation assembly further includes afirst sliding member, the first sliding member slidably sleeves on thefirst rotation shaft, and the first end of the first connection rod isrotatably connected to the first sliding member. The second rotationassembly further includes a second sliding member, the second slidingmember slidably sleeves on the second rotation shaft, and the first endof the second connection rod is rotatably connected to the secondsliding member.

In some embodiments, the first rotation assembly further includes afirst support connected to the first sliding plate, the first rotationshaft is arranged on the first support, and the first sliding member isarranged between the first support and the first sliding plate. Thesecond rotation assembly further includes a second support connected tothe second sliding plate, the second rotation shaft is arranged on thesecond support, and the second sliding member is arranged between thesecond support and the second sliding plate.

In some embodiments, the first rotation assembly further includes afirst elastic sheet arranged inside the first support, the first elasticsheet includes two first engaging portions, and each of the two firstengaging portions corresponds to each of two extreme positions of thefirst sliding member. The second rotation assembly further comprises asecond elastic sheet arranged inside the second support, the secondelastic sheet includes two second engaging portions, and each of the twosecond engaging portions corresponds to each of two extreme positions ofthe second sliding member.

In some embodiments, the first shell includes a first front shell and afirst back shell engaged with each other, the second shell includes asecond front shell and a second back shell engaged with each other, andthe flexible display screen is arranged on the first front shell and thesecond front shell.

In some embodiments, the first front shell is arranged with a firstlatch, and the first sliding plate has a first notch corresponding tothe first latch. Alternatively, the first front shell has a first notch,and the first sliding plate is arranged with a first latch correspondingto the first notch. Alternatively, the first front shell is arrangedwith a first latch and has a first notch, the first sliding plate isarranged with a first latch and has a first notch; the first latch onthe first front shell is in correspondence with the first notch of thefirst sliding plate, and the first notch of the first front shell is incorrespondence with the first latch on the first sliding plate.

In some embodiments, the second front shell is arranged with a secondlatch, and the second sliding plate has a second notch corresponding tothe second latch. Alternatively, the second front shell has a secondnotch, and the second sliding plate is arranged with a second latchcorresponding to the second notch. Alternatively, the second front shellis arranged with a second latch and has a second notch, the secondsliding plate is arranged with a second latch and has a second notch;the second latch on the second front shell is in correspondence with thesecond notch of the second sliding plate, and the second notch of thesecond front shell is in correspondence with the second latch on thesecond sliding plate.

In some embodiments, the foldable mobile terminal may further include ajoining sheet, crossing over the first sliding plate and the secondsliding plate; and two pressing elements. Each of two ends of thejoining sheet is slidably connected to the first front shell and thesecond front shell through a corresponding one of the two pressingelements, and a position of each of the two pressing elements withrespect to the joining sheet changes during folding and unfolding of thefirst shell and the second shell.

In some embodiments, the foldable mobile terminal may further include afirst decoration component, disposed at one end of the first slidingplate and one end of the second sliding plate, and connected to both thefirst front shell and the second front shell; and a second decorationcomponent, disposed at the other end of the first sliding plate and theother end of the second sliding plate, and connected to both the firstfront shell and the second front shell.

In some embodiments, the foldable mobile terminal may further include asupportive strip. The supportive strip is configured in a gap formedbetween the first sliding plate and the second sliding plate andconfigured to support the flexible display screen cooperatively with thefirst sliding plate and second sliding plate.

In some embodiments, a top face of the supportive strip is facingtowards the flexible display screen and is a curved face.

According to another aspect of the present disclosure, a foldablemechanism for a foldable mobile terminal may be provided. The foldablemobile terminal may include a first shell and a second shell connectedto each other. The foldable mechanism may include a first rotationassembly capable of being connected to the first shell and a secondrotation assembly capable of being connected to the second shell. Thefirst rotation assembly may include: a first sliding plate, capable ofbeing at least partially received in the first shell and able to slidetowards or away from the first shell; a first rotation shaft, arrangedon the first sliding plate; and a first connection rod, wherein a firstend of the first connection rod is slidably hinged to the first rotationshaft, and a second end of the first connection rod is capable of beingrotatably connected to the first shell. The second rotation assembly mayinclude: a second sliding plate, capable of being at least partiallyreceived in the second shell and able to slide towards or away from thesecond shell; a second rotation shaft, arranged on the second slidingplate; and a second connection rod, wherein a first end of the secondconnection rod is slidably hinged to the second rotation shaft, and asecond end of the second connection rod is capable of being rotatablyconnected to the second shell.

In some embodiments, the foldable mechanism further includes a linkageelement connected to the first rotation shaft and the second rotationshaft. The linkage element has a first through hole and a second throughhole; the first rotation shaft is arranged to extend through the firstthrough hole, and the second rotation shaft is arranged to extendthrough the second through hole.

In some embodiments, the first rotation assembly further includes afirst sliding member, the first sliding member slidably sleeves on thefirst rotation shaft, and the first end of the first connection rod isrotatably connected to the first sliding member. The second rotationassembly further includes a second sliding member, the second slidingmember slidably sleeves on the second rotation shaft, and the first endof the second connection rod is rotatably connected to the secondsliding member.

In some embodiments, the first rotation assembly further includes afirst support connected to the first sliding plate, the first rotationshaft is arranged on the first support, and the first sliding member isarranged between the first support and the first sliding plate. Thesecond rotation assembly further includes a second support connected tothe second sliding plate, the second rotation shaft is arranged on thesecond support, and the second sliding member is arranged between thesecond support and the second sliding plate.

In some embodiments, the first rotation assembly further includes afirst elastic sheet arranged inside the first support, the first elasticsheet includes two first engaging portions, and each of the two firstengaging portions corresponds to each of two extreme positions of thefirst sliding member. The second rotation assembly further includes asecond elastic sheet arranged inside the second support, the secondelastic sheet includes two second engaging portions, and each of the twosecond engaging portions corresponds to each of two extreme positions ofthe second sliding member.

According to still another aspect of the present disclosure, a foldableunit for a foldable mobile terminal may be provided and include: a firstcase, a second case, and a foldable mechanism. The first case may have afirst chamber, and the second case may have a second chamber. Thefoldable mechanism may be connected to the first case and the secondcase and include: a first substrate, at least partially received in thefirst chamber and able to slide towards or away from the first case; afirst rotation shaft, capable of being arranged on the first substrate;a first connection rod, wherein a first end of the first connection rodis slidably hinged to the first rotation shaft, and a second end of thefirst connection rod is rotatably connected to the first case; a secondsubstrate, at least partially received in the second chamber and able toslide towards or away from the second case; a second rotation shaft,capable of being arranged on the second substrate; and a secondconnection rod, wherein a first end of the second connection rod isslidably hinged to the second rotation shaft, and a second end of thesecond connection rod is rotatably connected to the second case.

As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, according to someembodiments of the present disclosure, a foldable mobile terminal may beprovided. The foldable mobile terminal may include a flexible displayscreen 10, a foldable mechanism 20, and a shell assembly 30. The shellassembly 30 may include a first shell 31 and a second shell 32. Thefoldable mechanism 20 may be connected between the first shell 31 andthe second shell 32. The flexible display screen 10 may be arranged onthe first shell 31 and the second shell 32. The foldable mobile terminalshown in FIG. 1 may be in an unfolded state, and the first shell 31 andthe second shell 32 may be symmetric to each other with respect to thefoldable mechanism 20. As shown in FIG. 19, when the first shell 31 andthe second shell 32 rotates to reach a completely folded state withrespect to the foldable mechanism 20, the flexible display screen 10 maybe arranged at an outside of the mobile terminal. As shown in FIG. 1, inthe unfolded state, an extending length of a side of the shell assembly30 facing towards the flexible display screen 10 (the length along adirection parallel to an X-axis shown in FIG. 1) may be substantiallyequal to an extending length of a side of the shell assembly 30 facingaway from the flexible display screen 10 (the length along the directionparallel to the X-axis shown in FIG. 1). However, as shown in FIG. 19,the shell assembly 30 itself may have a thickness (the thickness isalong a direction parallel to an Y-axis shown in FIG. 1), in a foldedstate, the extending length of the side of the shell assembly 30 facingtowards the flexible display screen 10 may be greater than the extendinglength of the side of the shell assembly 30 facing away from theflexible display screen 10. By providing the foldable mechanism 20, thefirst shell 31 and the second shell 32 may adapt to a length differencegenerated while switching between the folded state and the unfoldedstate.

The first shell 31 may include a first front shell 311 and a first backshell 312 connected to each other. The second shell 32 may include asecond front shell 321 and a second back shell 322 connected to eachother. The connection may be achieved by screwing, adhesion, welding,and the like. The flexible display screen 10 may be disposed on thefirst front shell 311 and the second front shell 321. The flexibledisplay screen 10 may have a display region, and the display region maybe rectangular or rounded rectangular in the unfolded state. A space maybe formed between the first front shell 311 and the first back shell 312along the direction parallel to the Y-axis. Similarly, a space may beformed between the second front shell 321 and the second back shell 322along the direction parallel to the Y-axis. The spaces may allowarrangement of a power module, a communication module, and othercomponents. The spaces may further allow the foldable mechanism 20 toslidably extend and retract with respect to the first shell 31 and thesecond shell 32; that is to say, the foldable mechanism 20 is slidableaway from or towards the first shell 31 and the second shell 32.

Another space may be formed between the first shell 31 and the secondshell 32 along the direction parallel to the X-axis. The foldablemechanism may be arranged within the space between the first shell 31and the second shell 32 along the direction parallel to the X-axis, andat least a partial structure of the foldable mechanism 20 may bereceived in the first shell 31 and the second shell 32. The spacebetween the first shell 31 and the second shell 32 along the directionparallel to the X-axis may be changed during the rotation of the firstshell 31 and the second shell around the foldable mechanism 20.Therefore, during the rotation of the first shell 31 and the secondshell 32 around the foldable mechanism 20, the foldable mechanism 20 maybe retracted into the first shell 31 and the second shell 32 at varyinglevels. As shown in FIG. 4 and FIG. 5, the foldable mechanism 20 mayinclude a first rotation assembly 50 and a second rotation assembly 60.The first rotation assembly 50 may be connected to the first shell 31.The rotation assembly 50 may be at least partially received inside thefirst shell 31, and may slidably extend and retract with respect to(i.e., slide away from or towards) the first shell 31. The secondrotation assembly 60 may be connected to the second shell 32. The secondrotation assembly 60 may be at least partially received inside secondshell 32, and may slidably extend and retract with respect to (slideaway from or towards) the second shell 32. By the slidable extension andretraction of the first rotation assembly 50 with respect to the firstshell 31 and the slidable extension and retraction of the secondrotation assembly 60 with respect to the second shell 32, the firstshell 31 and the second shell 32 may adapt to a length differencegenerated while switching between the folded state and the unfoldedstate.

In some embodiments, the first rotation assembly 50 and the secondrotation assembly 60 may have a same structure. The first rotationassembly 50 and the second rotation assembly 60 may be symmetricallydistributed about a central axis I-I (shown in FIG. 5) between the firstrotation assembly 50 and the second rotation assembly 60. By arrangingthe first rotation assembly 50 and the second rotation assembly 60 to besymmetric to each other, the first shell 31 and the second shell 32 maybe folded and unfolded symmetrically about the central axis I-I.

As further shown in FIG. 4, FIG. 5, FIG. 6, and FIG. 7, the firstrotation assembly 50 may include a first sliding plate 51, a firstrotation shaft 53, and a first connection rod 54. The first rotationshaft 53 may be arranged on the first sliding plate 51. A first end 541of the first connection rod 54 may be slidably hinged to the firstrotation shaft 53, and a second end 542 of the first connection rod 54may be rotatably connected to the first shell 31. The first slidingplate 51 may be at least partially received in the first shell 31, andslidably extend and retract with respect to (i.e., slide away from ortowards) the first shell 31. While the first shell 31 and the secondshell 32 folds and unfolds symmetrically, the first sliding plate 51together with the first rotation shaft 53 may slidably extend andretract with respect to (i.e., slide away from or towards) the firstshell 31. The second end 542 of the first connection rod 54 may rotatewith respect to the first shell 31. The first end 541 of the firstconnection rod 54 may slide on the first rotation shaft 53 and rotatewith respect to the first rotation shaft 53. By changing a level atwhich the first sliding plate 51 is received inside the first shell31,it is possible to adapt to a length difference generated during thefolding and unfolding of the first shell 31 and the second shell 32.

According to some embodiments shown in FIG. 2 and FIG. 3, two firstrotation shafts 53 and two first connection rods 54 may be arranged onthe first sliding plate 51. The two first rotation shafts 53 may bearranged symmetrically about a middle position of the first slidingplate 51 along a direction parallel to a Z-axis, and the two firstconnection rods 54 may be arranged symmetrically about a middle positionof the first sliding plate 51 along the direction parallel to theZ-axis. In some other embodiments, the number of the first rotationshaft 53 may be one or more, and the number of the first connection rod54 may be one or more. Slidable extension and retraction of the firstsliding plate 51 with respect to the first shell 31 may be achieved withvarious numbers of the first rotation shafts 53 and the first connectionrods 54.

As shown in FIG. 4, FIG. 5, FIG. 6, and FIG. 7, the second rotationassembly 60 may include a second sliding plate 61, a second rotationshaft 63, and a second connection rod 64. The second rotation shaft 63may be arranged on the second sliding plate 61. A first end 641 of thesecond connection rod 64 may be slidably hinged to the second rotationshaft 63, and a second end 642 of the second connection rod 64 may berotatably connected to the second shell 32. The second sliding plate 61may be at least partially received in the second shell 32, and slidablyextend and retract with respect to (i.e., slide away from or towards)the second shell 32. While the first shell 31 and the second shell 32folds and unfolds symmetrically, the second sliding plate 61 togetherwith the second rotation shaft 63 may slidably extend and retract withrespect to (i.e., slide away from or towards) the second shell 32. Thesecond end 642 of the second connection rod 64 may rotate with respectto the second shell 32. The first end 641 of the second connection rod64 may slide on the second rotation shaft 63 and rotate with respect tothe second rotation shaft 63. By changing a level at which the secondsliding plate 61 is received in the second shell 32, it is possible toadapt to a length difference generated during the folding and unfoldingof the first shell 31 and the second shell 32.

According to some embodiments shown in FIG. 2 and FIG. 3, two secondrotation shafts 63 and two second connection rods 64 may be arranged onthe second sliding plate 61. The two second rotation shafts 63 may bearranged symmetrically about a middle position of the second slidingplate 61 along the direction parallel to the Z-axis, and the two secondconnection rods 64 may be arranged symmetrically about a middle positionof the second sliding plate 61 along the direction parallel to theZ-axis. In some other embodiments, the number of the second rotationshafts 63 may be one or more, and the number of the second connectionrods 64 may be one or more. Slidable extension and retraction of thesecond sliding plate 61 with respect to the second shell 32 may beachieved with various numbers of the second rotation shafts 63 and thesecond connection rods 64.

As shown in FIG. 8 and FIG. 9, in some embodiments, the foldablemechanism 20 may include a linkage element 22 connected to the firstrotation shaft 53 and the second rotation shaft 63. The linkage element22 may have a first through hole 221 and a second through hole 222. Thefirst through hole 221 and the second through hole 222 may be spacedapart from each other. The first rotation shaft 53 may be arranged toextend through the first through hole 221, and the second rotation shaft63 may be arranged to extend through the second through hole 222. Thelinkage element 22 may link the first end 541 of the first connectionrod 54 and the first end 641 of the second connection rod 64 to move atthe same time. That is, by virtue of the linkage element 22, sliding ofthe first end 541 of the first connection rod 54 along the firstrotation shaft 53 may lead to sliding of the first end 641 of the secondconnection rod 64 along the second rotation shaft 63, and vice versa.

The linkage element 22 may allow the first connection rod 54 which isslidably hinged to the first rotation shaft 53 and the second connectionrod 64 which is slidably hinged to the second rotation shaft 63 to movesynchronously. That is, the slidable extension and retraction of thefirst sliding plate 51 with respect to the first shell 31 is synchronouswith the slidable extension and retraction of the second sliding plate61 with respect to the second shell 32, such that a symmetric foldingand unfolding of the first shell 31 and the second shell 32 may befurther achieved. The linkage element 22 may be made of metals orplastics.

In other embodiments, functions of the linkage element 22 may beachieved by other components. For example, a component configured toachieve a slidable hinge between the first connection rod 54 and thefirst rotation shaft 53 and a component configured to achieve a slidablehinge between the second connection rod 64 and the second rotation shaft63 may be configured as an integral component. By configuring anintegral component to achieve the slidable hinge, the first connectionrod 54 which is slidably hinged to the first rotation shaft 53 and thesecond connection rod 64 which is slidably hinged to the second rotationshaft 63 may move synchronously.

As shown in FIG. 7, FIG. 8, and FIG. 9, in some embodiments, the firstrotation assembly 50 may further include a first sliding member 52configured to achieve the slidable hinge between the first connectionrod 54 and the first rotation shaft 53. The first sliding member 52 maybe arranged to slidably sleeve on the first rotation shaft 53, and thefirst end 541 of the first connection rod 54 may be rotatably connectedto the first sliding member 52.

In some embodiments, the first sliding member 52 may include two sleevetubes 521 and a connection arm 522 connected between the two sleevetubes 521. The first rotation shaft 53 may extend through the sleevetubes 521 of the first sliding member 52. The first sliding member 52may slide along the first rotation shaft 53 and rotate with respect tothe first rotation shaft 53.

The first end 541 of the first connection rod 54 may be rotatablyconnected to the connection arm 522 of the first sliding member 52.Further, the connection arm 522 of the first sliding member 52 may havea first positioning hole 523, and the first end 541 of the firstconnection rod 54 may have a first positioning protrusion 543. The firstpositioning protrusion 543 may be inserted into the first positioninghole 523.

The second rotation assembly 60 may further include a second slidingmember 62. The slidable hinge between the second connection rod 64 andthe second rotation shaft 63 may be achieved by the second slidingmember 62. The second sliding member 62 may be arranged to sleeve on thesecond rotation shaft 63 in a slidable manner, and the first end 641 ofthe second connection rod 64 may be rotatably connected to the secondsliding member 62.

In some embodiments, the second sliding member 62 may include two sleevetubes 621 and a connection arm 622 connected between the two sleevetubes 621. The second rotation shaft 63 may extend through the sleevetubes 621 of the second sliding member 62. The second sliding member 62may slide along the second rotation shaft 63 and rotate with respect tothe second rotation shaft 63.

The first end 641 of the second connection rod 64 may be rotatablyconnected to the connection arm 622 of the second sliding member 62.Further, the connection arm 622 of the second sliding member 62 may havea second positioning hole 623, and a first end 641 of the secondconnection rod 64 may have a second positioning protrusion 643. Thesecond positioning protrusion 643 may be inserted into the secondpositioning hole 623.

In some embodiments, the linkage element 22 may include a first armportion 223 having the first through hole 221 and a second arm portion224 having the second through hole 222. The first arm portion 223 may bearranged between the two sleeve tubes 521 of the first sliding member52. The second arm portion 224 may be arranged between the two sleevetubes 621 of the second sliding member 62. The first rotation shaft 53may extend through the first through hole 221, and the second rotationshaft 63 may extend through the second through hole 222. The linkageelement 22 may serve as a link between the first sliding member 52 andthe second sliding member 62, such that the sliding of the first slidingmember 52 along the first rotation shaft 53 may be synchronous with thesliding of the second sliding member 62 along the second rotation shaft63.

As shown in FIG. 4, FIG. 5, FIG. 6, and FIG. 7, in some embodiments, thefirst rotation assembly 50 may further include a first support 56, andthe first rotation shaft 53 may be configured on the first sliding plate51 through the first support 56. Further, the first support 56 may befixed on the first sliding plate 51 by screw fastening. The firstrotation shaft 53 may extend through the first support 56, and the firstsliding member 52 may be arranged between the first support 56 and thefirst sliding plate 51. By arranging the first support 56, relativemovement of the first sliding member 52, the first end 541 of the firstconnection rod 54, and the first rotation shaft 53 may be restrictedwithin a space between the first support 56 and the first sliding plate51, such that a possibility of the first end 541 of the first connectionrod 54 detaching from the first sliding member 52 may be reduced.

The rotatable connection between the second end 542 of the firstconnection rod 54 and the first shell 31 may be achieved by a rotatableconnection between the second end 542 of the first connection rod 54 andthe first front shell 311. Alternatively, the rotatable connectionbetween the second end 542 of the first connection rod 54 and the firstshell 31 may be achieved by a rotatable connection between the secondend 542 of the first connection rod 54 and the first back shell 312.Alternatively, the rotatable connection between the second end 542 ofthe first connection rod 54 and the first shell 31 may be achieved byrotatably connecting the second end 542 of the first connection rod 54to the first front shell 311 and the first back shell 312 at the sametime. In some embodiments, as shown in FIG. 8, FIG. 9, and FIG. 11, thefirst front shell 311 may have a first connection hole 313, and a firstconnection protrusion 544 may be arranged at the second end 542 of thefirst connection rod 54. The first connection protrusion 544 may beinserted into the first connection hole 313. Further, as shown in FIG.13 and FIG. 15, the first rotation assembly 50 may further include afirst pressing sheet 55. The first pressing sheet 55 may be connected tothe first front shell 311, and configured to limit a position of thefirst connection rod 54, such that the first connection rod 54 may bedisposed between the first pressing sheet 55 and the first front shell311.

As shown in FIG. 4, FIG. 5, FIG. 6, and FIG. 7, in some embodiments, thesecond rotation assembly 60 may further include a second support 66, andthe second rotation shaft 63 may be configured on the second slidingplate 61 through the second support 66. Further, the second support 66may be fixed on the second sliding plate 61 by screw fastening. Thesecond rotation shaft 63 may extend through the second support 66, andthe second sliding member 62 may be arranged between the second support66 and the second sliding plate 61. By arranging the second support 66,relative movement of the second sliding member 62, the first end 641 ofthe second connection rod 64, and the second rotation shaft 63 may berestricted within a space between the second support 66 and the secondsliding plate 61, such that a possibility of the first end 641 of thesecond connection rod 64 detaching from the second sliding member 62 maybe reduced.

The rotatable connection between the second end 642 of the secondconnection rod 64 and the second shell 32 may be achieved by a rotatableconnection between the second end 642 of the second connection rod 64and the second front shell 321. Alternatively, the rotatable connectionbetween the second end 642 of the second connection rod 64 and thesecond shell 32 may be achieved by a rotatable connection between thesecond end 642 of the second connection rod 64 and the second back shell322. Alternatively, the rotatable connection between the second end 642of the second connection rod 64 and the second shell 32 may be achievedby rotatably connecting the second end 642 of the second connection rod64 to the second front shell 321 and the second back shell 322 at thesame time. In some embodiments, as shown in FIG. 8, FIG. 9, and FIG. 11,the second front shell 321 may have a second connection hole 323, and asecond connection protrusion 644 may be arranged at the second end 642of the second connection rod 64. The second connection protrusion 644may be inserted into the second connection hole 323. Further, as shownin FIG. 13 and FIG. 15, the second rotation assembly 60 may furtherinclude a second pressing sheet 65. The second pressing sheet 65 may beconnected to the second front shell 321, and configured to limit aposition of the second connection rod 64, such that the secondconnection rod 64 may be disposed between the second pressing sheet 65and the second front shell 321.

As shown in FIG. 8 and FIG. 9, the foldable mechanism 20 may furtherinclude a first shaft sleeve 24 a and a second shaft sleeve 24 b. Thefirst shaft sleeve 24 a may be disposed at one end of the first rotationshaft 53 and one end of the second rotation shaft 63, and may beconnected to both the first rotation shaft 53 and the second rotationshaft 63. The second shaft sleeve 24 b may be disposed at the other endof the first rotation shaft 53 and the other end of the second rotationshaft 63, and may be connected to both the first rotation shaft 53 andthe second rotation shaft 63. The first and the second shaft sleeves 24a and 24 b may be configured to fix the first rotation shaft 53 on thefirst support 56, and fix the second rotation shaft 63 on the secondsupport 66. The first support 56, the second support 66, the firstrotation shaft 53, and the second rotation shaft 63 may be provided withequal number. In some embodiments, the number of the first supports 56and the number of the second supports 66 may both be two. Each firstsupport 56 may be arranged at a corresponding end of the first slidingplate 51 along the direction parallel to the Z-axis, and each secondsupport 66 may be arranged at a corresponding end of the second slidingplate 61 along the direction parallel to the Z-axis.

In some embodiments, as shown in FIG. 4 and FIG. 7, the foldablemechanism 20 may further include a supportive strip 26. The supportivestrip 26 may be arranged between the first rotation assembly 50 and thesecond rotation assembly 60. The supportive strip 26 may be configuredto support the flexible display screen 10. The supportive strip 26 mayextend for a certain length along the direction parallel to the Z-axisin order to be arranged in a gap between the first sliding plate 51 andthe second sliding plate 61. According to some embodiments provided withthe first support 56 and the second support 66, the supportive strip 26may further extend into a gap between the first support 56 and thesecond support 66. The supportive strip 26, the first sliding plate 51,the second sliding plate 61, the first support 56, the second support66, the first front shell 311, and the second front shell 321 maycooperatively support the flexible display screen 10.

As shown in FIG. 8 and FIG. 9, the linkage element 22 may have areceiving recess 226. At least a partial structure of the supportivestrip may be received in the receiving recess 226. In some embodiments,the linkage element 22 may include a connection portion 225 connectingwith the first arm portion 223 and the second arm portion 224, and thereceiving recess 226 may be formed on the connection portion 225.

As shown in FIG. 8 and FIG. 9, in other embodiments, at least one of thefirst shaft sleeve 24 a and the second shaft sleeve 24 b may also have areceiving recess 241, and at least a partial structure of the supportivestrip 26 may be received in the receiving recess 241. At least one ofthe connection between the supportive strip 26 and the first shaftsleeve 24 a and the second shaft sleeve 24 b and the connection betweenthe supportive strip 26 and the linkage element 22 may be achieved bywelding or other means.

As shown in FIG. 20, FIG. 23, FIG. 24, and FIG. 25, a top face 261 ofthe supportive strip 26 faces towards the flexible display screen 10,and the top face 261 of the supportive strip 26 may be a curved face.When the foldable mobile terminal is in a semi-folded state as shown inFIG. 24 or in a folded state as shown in FIG. 25, as the supportivestrip 26 has a curved face, a curvature of a contour of the mobileterminal may not be changed sharply during the folding of the firstshell 31 and the second shell 32. Therefore, the flexible display screen10 may be better supported.

As shown in FIG. 7, FIG. 8, and FIG. 9, in some embodiments, the firstrotation assembly 50 may further include a first elastic sheet 57arranged on the first sliding plate 51. The first end 541 of the firstconnection rod 54 may reach two extreme positions along a direction ofsliding, the first elastic sheet 57 may include two first engagingportions 571. Each of the two first engaging portions 571 may correspondto each of the two extreme positions. In the embodiments provided withthe first support 56, the first elastic sheet 57 may be fixed on thefirst sliding plate 51 through the first support 56, and the firstelastic sheet 57 may be disposed inside the first support 56.

The two first engaging portions 571 of the first elastic sheet 57 mayrespectively correspond to two ends of a sliding path of the first end541 of the first connection rod 54 while the first end 541 slides alongthe first rotation shaft 53. To some extent, interference may begenerated between each first engaging portion 571 and the first end 541of the first connection rod 54, such that the first engaging portion 571may apply a clamping force to the first end 541 of the first connectionrod 54, and the position of the first connection rod 54 may not bechanged randomly. Therefore, the first sliding plate 51 may be arrangedat a stable position with respect to the first shell 31, that is, thefoldable mobile terminal may stably remain in the folded or unfoldedstate.

In some embodiments, the first positioning protrusion 543 at the firstend 541 of the first connection rod 54 may extend through two opposingsides of the first end 541. An end of the first positioning protrusion543 may be engaged in the first positioning hole 523 of the firstsliding member 52, and an opposing end of the first positioningprotrusion 543 may be inserted into the first engaging portion 571 ofthe first elastic sheet 57. The first engaging portion 571 may clamp thefirst positioning protrusion 543 to apply a certain clamping force tothe first connection rod 54.

In some embodiments, the first elastic sheet 57 may further include afirst damping portion 572 disposed between the two first engagingportions 571. When the first end 541 of the first connection rod 54slides from the first engaging portion 571 to the first damping portion572, a resistance may be increased. Increasing of the resistance may beachieved as a clamping force applied to the first positioning protrusion543 by the first damping portion 572 is greater than the clamping forceapplied to the first positioning protrusion 543 by the first engagingportion 571. For example, the first elastic sheet 57 may bestadium-shaped with an opening at an end and closed at an opposing end.The two first engaging portions 571 may be arranged at the two oppositeends of the first elastic sheet 57, and the first damping portion 572may be arranged at a middle portion of the first elastic sheet 57. Afirst gap 572 a formed in the first damping portion 572 for the firstpositioning protrusion 543 to extend through may be smaller than asecond gap 571 a formed in the first engaging portion 571 for the firstpositioning protrusion 543 to extend through. Therefore, during thesliding from the first engaging portion 571 to the first damping portion572, the first connection rod 54 may receive an increased resistance. Byarranging the first elastic sheet 57 in such manner, when rotating thefirst shell 31 and the second shell 32 of the foldable mobile terminal,a user may feel the resistance more obviously.

In some other embodiments, the first elastic sheet 57 may be in shape ofa closed loop. Further, in yet other embodiments, the first elasticsheet 57 may include two separated strips. Two ends of each of the twoseparated strips may be fixed on the first sliding plate 51 through thefirst support 56 or other components (or by other means), such that thefirst connection rod 54 may be applied with different resistances whenthe first connection rod 54 is at various positions of the sliding pathalong the first rotation shaft 53.

As shown in FIG. 9, the first support 56 may have a first receivingcavity 560, and the first elastic sheet 57 may be received in the firstreceiving cavity 560. After the first support 56 is fixed on the firstsliding plate 51, the first sliding plate 51 may close the firstreceiving cavity 560, such that the first elastic sheet 57 may be fixedinside the first receiving cavity 560.

Further, the first receiving cavity 560 may include two firstpositioning cavities 561 and a first releasing cavity 562. Each of thetwo first positioning cavities 561 may correspond to each of the firstengaging portion 571 of the first elastic sheet 57. The first releasingcavity 562 may be formed between the two first positioning cavities 561.A size of the first releasing cavity 562 may be greater than a size ofeach first positioning cavity 561. After the first engaging portion 571is arranged in the first positioning cavity 561, the first engagingportion 571 may be fixed to be unmovable. The first damping portion 572arranged between the two first engaging portions 571 may becorrespondingly arranged in the first releasing cavity 562. The firstreleasing cavity 562 may offer a space allowing the first dampingportion 572 to be elastically deformed.

In some embodiments, the second rotation assembly 60 may further includea second elastic sheet 67 arranged on the second sliding plate 61. Thefirst end 641 of the second connection rod 64 may reach two extremepositions along a direction of sliding, and the second elastic sheet 67may include two second engaging portions 671. Each of the two secondengaging portions 671 may correspond to each of the two extremepositions. In the embodiments provided with the second support 66, thesecond elastic sheet 67 may be fixed on the second sliding plate 61through the second support 66, and the second elastic sheet 67 may bedisposed inside the second support 66.

The two second engaging portions 671 of the second elastic sheet 67 mayrespectively correspond to two ends of a sliding path of the first end641 of the second connection rod 64 while the first end 641 slides alongthe second rotation shaft 63. To some extent, interference may begenerated between each second engaging portion 671 and the first end 641of the second connection rod 64, such that the second engaging portion671 may apply a clamping force to the first end 641 of the secondconnection rod 64, and the position of the second connection rod 64 maynot be changed randomly. Therefore, the second sliding plate 61 may bearranged at a stable position with respect to the second shell 32, thatis the foldable mobile terminal may stably remain in the folded orunfolded state.

In some embodiments, the second positioning protrusion 643 at the firstend 641 of the second connection rod 64 may extend through two opposingsides of the first end 641. An end of the second positioning protrusion643 may be engaged in the second positioning hole 623 of the secondsliding member 62, and an opposing end of the second positioningprotrusion 643 may be inserted into the second engaging portion 671 ofthe second elastic sheet 67. The second engaging portion 671 may clampthe second positioning protrusion 643 to apply a certain clamping forceto the second connection rod 64.

As shown in FIG. 4, FIG. 5, FIG. 21, and FIG. 22, FIG. 5 illustrates thesliding mechanism 20 in the unfolded state, and the second positioningprotrusion 643 arrange at the first end 641 of the second connection rod64 may be inserted into one of the second engaging portions 671, asshown in FIG. 5. FIG. 22 illustrates the sliding mechanism 20 in thefolded state, and the second positioning protrusion 643 arrange at thefirst end 641 of the second connection rod 64 may be inserted into theother one of second engaging portions 671, as shown in FIG. 22.

In some embodiments, the second elastic sheet 67 may further include asecond damping portion 672 disposed between the two second engagingportions 671. When the first end 641 of the second connection rod 64slides from the second engaging portion 671 to the second dampingportion 672, a resistance may be increased. Increasing of the resistancemay be achieved as a clamping force applied to the second positioningprotrusion 643 by the second damping portion 672 is greater than theclamping force applied to the second positioning protrusion 643 by thesecond engaging portion 671. For example, the second elastic sheet 67may be stadium-shaped with an opening at an end and closed at anopposing end. The two second engaging portions 671 may be arranged attwo ends of the second elastic sheet 67, and the second damping portion672 may be arranged at a middle portion of the second elastic sheet 67.A third gap 672 a formed in the second damping portion 672 for thesecond positioning protrusion 643 to extend through may be smaller thana fourth gap 671 a formed in the second engaging portion 671 for thesecond positioning protrusion 643 to extend through. Therefore, duringthe sliding from the second engaging portion 671 to the second dampingportion 672, the second connection rod 64 may receive an increasedresistance. By arranging the second elastic sheet 67 in this manner,when rotating the first shell 31 and the second shell 32 of the foldablemobile terminal, the user may feel the resistance more obviously.

In some other embodiments, the second elastic sheet 67 may be in shapeof a closed loop. Further, in yet other embodiments, the second elasticsheet 67 may include two separated strips. Two ends of each of the twoseparated strips may be fixed on the second sliding plate 61 through thesecond support 66 or other components (or by other means), such that thesecond connection rod 64 may be applied with different resistances whenthe second connection rod 64 is at various positions of the sliding pathalong the second rotation shaft 63.

As shown in FIG. 9, the second support 66 may have a second receivingcavity 660, and the second elastic sheet 67 may be received in thesecond receiving cavity 660. After the second support 66 is fixed on thesecond sliding plate 61, the second sliding plate 61 may close thesecond receiving cavity 660, such that the second elastic sheet 67 maybe fixed inside the second receiving cavity 660.

Further, the second receiving cavity 660 may include two secondpositioning cavities 661 and a second releasing cavity 662. Each of thetwo second positioning cavities 661 may correspond to each secondengaging portion 671 of the second elastic sheet 67. The secondreleasing cavity 662 may be formed between the two second positioningcavities 661. A size of the second releasing cavity 662 may be greaterthan a size of each second positioning cavity 661. After the secondengaging portion 671 is arranged in the second positioning cavity 661,the second engaging portion 671 may be fixed to be unmovable. The seconddamping portion 672 arranged between the two second engaging portions671 may be arranged in the second releasing cavity 662. The secondreleasing cavity 662 may offer a space allowing the second dampingportion 672 to be elastically deformed.

As shown in FIG. 10, FIG. 11, and FIG. 12, in some embodiments, thefoldable mobile terminal may further include a joining sheet 70 and twopressing elements 71. The joining sheet 70 may cross over the firstrotation assembly 50 and the second rotation assembly 60, and each endof the joining sheet 70 may be rotatably connected to the first shell 31and the second shell 32 through each of the two pressing elements 71respectively. A change of the length generated during the rotation ofthe first shell 31 and the second shell 32 may adapt by the extensionand retraction of the first rotation assembly 50 and the second rotationassembly 60 of the sliding mechanism 20 with respect to the first shell31 and the second shell 32, respectively. In this way, a contour of thefoldable mobile terminal may be uniform and complete during folding andunfolding. By arranging the joining sheet 70, the first shell 31 and thesecond shell 32 may be protected from being overly stretched, and apossibility of the flexible display screen 10 being damaged by thestretching may be reduced.

As shown in FIG. 16, a first end 701 of the joining sheet 70 may have afirst elongated hole 703, and a second end 702 of the joining sheet 70may have a second elongated hole 704. One of the pressing elements 71may extend through the first elongated hole 703, and be further fixedlyconnected to the first shell 31, and the other of the pressing elements71 may extend through the second elongated hole 704, and be furtherfixedly connected to the second shell 32. When the first rotationassembly 50 slides towards and away from the first shell 31 and thesecond rotation assembly 60 slides towards and away from the secondshell 32, the joining sheet 70 may move with respect to the pressingelements 71 along a direction to which the first elongated hole 703 andthe second elongated hole 704 elongate, that is, the joining sheet 70may move with respect to the first shell 31 and the second shell 32. Asshown in FIG. 12, when the foldable mobile terminal is in the unfoldedstate, an outer end of the first elongated hole 703 and an outer end ofthe second elongated hole 704 of the joining sheet 70, that is, an endof the first elongated hole 703 away from the first rotation assembly 50and an end of the second elongated hole 704 away from the secondrotation assembly 60, may abut against the corresponding pressingelement 71. In this way, a possibility of the first shell 31 and thesecond shell 32 departing from each other continually may be reduced,and the first shell 31 and the second shell 32 may be protected frombeing overly stretched. During folding, by virtue of space of the firstand the second elongated holes, the joining sheet 70 may slide withrespect to the first shell 31 and the second shell 32 to adapt to thelength change of the first and the second shells 31 and 32. In someembodiments, holes in other shapes may be formed to replace the firstelongated hole 703 and the second elongated hole 704, and two pressingelements 71 may be connected to the first or second shells in othermeans.

The joining sheet 70 may include two joining portions 705 respectivelylocated at the first end 701 and the second end 702, and a supportiveportion 706 connected between the two joining portions 705. Each of thetwo joining portions 705 may be connected to each pressing element 71,and the supportive portion 706 may be configured to support the flexibledisplay screen 10.

In some embodiments, the pressing element 71 may include a screw orother fastening elements. The screw or other fastening elements of onepressing element 71 may extend through the first elongated hole 703, andthen connect the joining sheet 70 to the first shell 31. The screw orother fastening elements of the other pressing element 71 may extendthrough the second elongated hole 704, and then connect the joiningsheet 70 to the second shell 32. In some embodiments, each pressingelement 71 may be cubic, and may include no screw or other fasteningelements. One pressing element 71 may be configured to press on thefirst end 701 of the joining sheet 70, and the other pressing element 71may be configured to press on the second end 702 of the joining sheet70. An additional fastening element may be configured to extend throughone pressing element 71 and the first elongated hole 703 to fasten withthe first shell 31, and another additional fastening element may beconfigured to extend through the other pressing element 71 and thesecond elongated hole 704 to fasten with the second shell 32. Forexample, the first front shell 311 may include a first mounting portion314, the first end 701 of the joining sheet 70 may be slidably connectedto the first mounting portion 314 through one of the pressing elements71. Similarly, the second front shell 321 may include a second mountingportion 324, and the second end 702 of the joining sheet 70 may beslidably connected to the second mounting portion 324 through the otherof the pressing elements 71. In some embodiments, the first mountingportion 314 may have a first mounting hole to allow a fastening elementto be mounted, such that one pressing element 71 and the first end 701of the joining sheet 70 may be fastened with the first shell 31.Similarly, the second mounting portion 324 may have a second mountinghole to allow another fastening element to be mounted, such that theother pressing element 71 and the second end 702 of the joining sheet 70may be fastened with the second shell 32.

In some embodiments, a bending portion may be formed at an intersectionbetween the supportive portion 706 and each of the two joining portions705. As shown in FIG. 12, each of the first mounting portion 314 and thesecond mounting portion 324 may be recessed to engage with the bendingportion of the corresponding joining sheet 70 and configured to receivethe corresponding pressing element 71.

The joining sheet 70 may have a plurality of through holes 700 withdistance apart from each other. In some embodiments, the plurality ofthrough holes 700 may be formed on the supportive portion 706. Thethrough holes 700 enable the joining sheet 70 to be bent easily, suchthat the joining sheet 70 may better fit with the first rotationassembly 50 and the second assembly 60, and a possibility of the joiningsheet 70 generating crease to impact the effect of supporting theflexible display screen 10 may be reduced.

In some embodiments, a fixing structure 707 connected to the supportivestrip 26 may be arranged on the supportive portion 706. In someembodiments, the fixing structure 707 may be a hole for welding. As thejoining sheet 70 crosses over the supportive strip 26, the joining sheet70 may be fixedly connected to the supportive strip 26 by welding. Insome other embodiments, the fixing structure 707 may be a protrusion,and a hole may be formed on the supportive strip, the protrusion may beadapted to or match with the hole, such that the joining sheet 70 may befixedly connected to the supportive strip 26 through the fixingstructure 707.

In some embodiments, the number of the joining sheets 70 may be two. Itmay be understood that, in other embodiments, the number of the joiningsheets 70 may be increased or decreased as required.

As shown in FIG. 10 and FIG. 11, in some embodiments, the foldablemobile terminal may further include a first decoration component 72 aand a second decoration component 72 b. The first decoration component72 a may be disposed at one end of the foldable mechanism 20 along thedirection parallel to the Z-axis, further disposed in the gap formedbetween the first shell 31 and the second shell 32. The seconddecoration component 72 b may be disposed at the other end of thefoldable mechanism 20 along the direction parallel to the Z-axis,further disposed in the gap formed between the first shell 31 and thesecond shell 32. The first and the second decoration components 72 a and72 b may be configured to cover structures at each end of the foldablemechanism 20, such that the structures may not be exposed to an outsideto impact the appearance.

As shown in FIG. 11, FIG. 13, and FIG. 14, the first front shell 311 mayinclude a first mating portion 315, and the second front shell 321 mayinclude a second mating portion 325. Each of the first decorationcomponent 72 a and the second decoration component 72 b may be engagedwith both the first mating portion 315 of the first front shell 311 andthe second mating portion 325 of the second front shell 321. Each of thefirst decoration component 72 a and the second decoration component 72 bmay be disposed at the corresponding end of the first sliding plate 51and the second sliding plate 61 along the direction parallel to theZ-axis.

As shown in FIG. 17 and FIG. 18, a surface of each of the firstdecoration component 72 a and the second decoration component 72 bfacing towards the flexible display screen 10 may be substantially flatto allow an easy configuration of the flexible display screen 10. Aconnective structure, such as a protruding block 721, may be arranged ona surface of each of the first decoration component 72 a and the seconddecoration component 72 b facing away from the flexible display screen10 and connected to the first front shell 311 and the second front shell321. A plurality of ridges 722 may be further arranged on the surface ofeach of the first decoration component 72 a and the second decorationcomponent 72 b facing away from the flexible display screen 10. When thefoldable mobile terminal is in the unfolded state, each of the firstdecoration component 72 a and the second decoration component 72 b maybe unfolded naturally. A distance between two adjacent ridges 722 may begradually increased in a direction away from the flexible display screen10. When each of the first decoration component 72 a and the seconddecoration component 72 b is bent, that is, when the foldable mobileterminal is in the folded state, the adjacent ridges 722 may contactwith each other.

As shown in FIG. 10 and FIG. 11, the first shell 31 may have two or morefirst notches 316 spaced apart from each other. In some embodiments, asshown in FIG. 14 and FIG. 15, each of the two or more first notches 316may be formed at a side of the first front shell 311 close to the firstrotation assembly 50. Two or more first latches 511 may be configured onthe first sliding plate 51 and correspond to the two or more firstnotches 316. When the foldable mobile terminal switches between thefolded state and the unfolded state, the first sliding plate 51 may bereceived in the first shell 31 at varying levels. By configuring thelatch on the first shell 31 and forming the notches in the first slidingplate 51 correspondingly, empty space between the first shell 31 and thefirst sliding plate 51 may be reduced, such that the flexible displayscreen 10 may be supported more stably and a possibility of the flexibledisplay screen 10 having functional damages due to a local stress may bereduced.

In some embodiments, as shown in FIG. 4 and FIG. 6, the first slidingplate 51 may include a first substrate 510, and the first latch 511 maybe arranged on the first substrate 510. The first substrate 510 may bedisposed between the first front shell 311 and the first back shell 312and may slidably extend and retract between the first front shell 311and the first back shell 312 (that is, slide away from or towards thefirst front shell 311). The first latch 511 and the first front shell311 may be in a same plane. Herein, the plane may be parallel to a planedefined by the XZ-axes. The first latch 511 and the first front shell311 may be configured to cooperatively support the flexible displayscreen 10.

It may be understood that another first notch may further be formed inthe first sliding plate 51 between two adjacent first latches 511, andanother first latch may further be arranged on the first front shell 311between two adjacent first notches 316. The first latch 511 on the firstsliding plate 51 may correspond to the first notch 316 on the firstfront shell 311, and the first notch on the first sliding plate 51 maycorrespond to the first latch arranged on the first front shell 311.

The second shell 32 may have two or more second notches 326 spaced apartfrom each other. In some embodiments, as shown in FIG. 14 and FIG. 15,each of the two or more second notches 326 may be formed at a side ofthe second front shell 321 close to the second rotation assembly 60. Twoor more second latches 611 may be configured on the second sliding plate61 and correspond to the two or more second notches 326. When thefoldable mobile terminal switches between the folded state and theunfolded state, the second sliding plate 61 may be received in thesecond shell 32 at varying levels. By configuring the latch on thesecond shell 32 and forming the notches in the second sliding plate 61correspondingly, empty space between the second shell 32 and the secondsliding plate 61 may be reduced, such that the flexible display screen10 may be supported more stably and a possibility of the flexibledisplay screen 10 having functional damages due to a local stress may bereduced.

In some embodiments, as shown in FIG. 4 and FIG. 6, the second slidingplate 61 may include a second substrate 610, and the second latch 611may be arranged on the second substrate 610. The second substrate 610may be disposed between the second front shell 321 and the second backshell 322 and may slidably extend and retract (that is, slide away fromor towards the second front shell 321) between the second front shell321 and the second back shell 322. The second latch 611 and the secondfront shell 321 may be in a same plane parallel to a plane defined bythe XZ-axes. The second latch 611 and the second front shell 321 may beconfigured to cooperatively support the flexible display screen 10.

It may be understood that another second notch may further be formed inthe second sliding plate 61 between two adjacent second latches 611, andanother second latch may further be arranged on the second front shell321 between two adjacent second notches 326. The second latch 611 on thesecond sliding plate 61 may correspond to the second notch 326 on thesecond front shell 321, and the second notch on the second sliding plate61 may correspond to the second latch arranged on the second front shell321.

As shown in FIG. 4, a gap 512 may be formed between the first latch 511on the first sliding plate 51 and the second latch 611 of the secondsliding plate 61. At least partial structure of the supportive strip 26may be received in the gap 512.

As shown in FIG. 4 and FIG. 6, on the first sliding plate 51, an end ofeach of the first latches 511 away from the first shell 31 may beconnected to each other to form a first supportive beam 513. On thesecond sliding plate 61, an end of each of the second latches 611 awayfrom the second shell 32 may be connected to each other to form a secondsupportive beam 613. At least a partial structure of the supportivestrip 26 may be disposed on the first supportive beam 513 and the secondsupportive beam 613.

As shown in FIG. 13, the foldable mobile terminal may further include afirst roller 58 and a first spring 59. The first roller 58 and the firstspring 59 may be disposed between the first rotation assembly 50 and thefirst shell 31. The first rotation assembly 50 may have a first groove514. When the first rotation assembly 50 slidably extends and retractswith respect to (that is, slides away from or towards) the first shell31, the first roller 58 may move into or out of the first groove 514,such that the user of the foldable mobile terminal may feel a standstillif the foldable mobile terminal is folded to an appropriate position. Insome embodiments, it is possible that the first roller 58 may move intothe first groove 514 when the first groove 514 slides away from thefirst shell 31, and move out of the first groove 514 when the firstgroove 514 slides towards the first shell 31. However, in someembodiments, it is also possible that the first roller 58 may move intothe first groove 514 when the first groove 514 slides towards the firstshell 31, and move out of the first groove 514 when the first groove 514slides away from the first shell 31. In some embodiments, the firstspring 59 may include at least one of a rubber spring, a gas spring, alead spring, a spiral spring, a torsion rod spring, and the like. Insome embodiments, a first elastic rubber may be provided to replace thefirst roller 58 and the spring 59, the first elastic rubber may bedisposed in the first groove 514 of the first rotation assembly 50 andabut against the first shell 31. The first elastic rubber may beelastically deformed to reduce mechanical shock generated during slidingof the first rotation assembly 50.

In some embodiments, the first roller 58 and the first spring 59 may bedisposed between the first sliding plate 51 and the first back shell312. In some other embodiments, the first roller 58 and the first spring59 may be disposed between the first sliding plate 51 and the firstfront shell 311. According to some embodiments shown in FIG. 4 and FIG.13, the first groove 514 may be formed in a side wall of the first latch511 of the first sliding plate 51 and face towards an adjacent firstlatch 511 arranged on the first substrate 510.

As shown in FIG. 13 and FIG. 15, a side wall in the first notch 316 maybe recessed inwardly away from a corresponding first latch 511 to form afirst cavity 317. The first roller 58 and the first spring 59 may bereceived in the first cavity 317. The first spring 59 may abut againstthe first roller 58 to allow at least a part of the first roller 58 tobe exposed to an outside of the first cavity 317, such that the firstroller 58 may elastically abut against a side wall of the correspondingfirst latch 511.

Further, the first latch 511 which has the first groove 514 may extendtowards the first shell 31 for a distance longer than any other firstlatch 511 extends towards the first shell 31, that is, a length forwhich the first latch 511 having the first groove 514 may extend towardsthe first shell 31 is greater than a length for which any other firstlatch 511 may extend towards the first shell 31.

In some embodiments, at least two sets of the first rollers 58 and thefirst springs 59 may be provided. Each of two opposing side walls of thefirst latch 511 may have the first groove 514 matching with the firstroller 58. Correspondingly, two opposing side walls of the first notch316 may be recessed away from the corresponding first latch 511 to formtwo first cavities 317. Each of the two first cavities 317 may be formedto receive one set of the first roller 58 and the first spring 59.

In some embodiments, the side wall of the first latch 511 may have twofirst grooves 514 at two terminating positions corresponding to thefirst sliding plate 51. For example, one of the terminating positionsmay be located at an end of the first latch 511 close to the first shell31, and the other one of the terminating positions may be located at anintersection between the first latch 511 and the first supportive beam513. When the foldable mobile terminal is in the folded state and theunfolded state, the first roller 58 may respectively enter the firstgroove 514 of the corresponding one of the two terminating positions.Therefore, the user of the foldable mobile terminal may feel astandstill if the foldable mobile terminal is folded or unfolded to anappropriate position.

The foldable mobile terminal may further include a second roller 68 anda second spring 69. The second roller 68 and the second spring 69 may bedisposed between the second rotation assembly 60 and the second shell32. The second rotation assembly 60 may have a second groove 614. Whenthe second rotation assembly 60 slidably extends and retracts withrespect to (that is, slides away from or towards) the second shell 32,the second roller 68 may move into or out of the second groove 614, suchthat the user of the foldable mobile terminal may feel a standstill ifthe foldable mobile terminal is folded to an appropriate position. Insome embodiments, the second spring 69 may include at least one of arubber spring, a gas spring, a lead spring, a spiral spring, a torsionrod spring, and the like. In some embodiments, a second elastic rubbermay be provided to replace the second roller 68 and the second spring69, the second elastic rubber may be disposed in the second groove 614of the second rotation assembly 60 and abut against the second shell 32.The second elastic rubber may be elastically deformed to reducemechanical shock generated during sliding of the second rotationassembly 60.

In some embodiments, the second roller 68 and the second spring 69 maybe disposed between the second sliding plate 61 and the second backshell 322. In some other embodiments, the second roller 68 and thesecond spring 69 may be disposed between the second sliding plate 61 andthe second front shell 321. According to some embodiments shown in FIG.4 and FIG. 13, the second groove 614 may be formed in a side wall of thesecond latch 611 of the second sliding plate 61, and face towards anadjacent second latch 611 arranged on the second substrate 610.

As shown in FIG. 13 and FIG. 15, a side wall in the second notch 326 maybe recessed inwardly away from a corresponding second latch 611 to forma second cavity 327. The second roller 68 and the second spring 69 maybe received in the second cavity 327. The second spring 69 may abutagainst the second roller 68 to allow at least a part of the secondroller 68 to be exposed to an outside of the second cavity 327, suchthat the second roller 68 may elastically abut against a side wall ofthe corresponding second latch 611.

Further, the second latch 611 which has the second groove 614 may extendtowards the second shell 32 for a distance longer than any other secondlatch 611 extending towards the second shell 32.

In some embodiments, at least two sets of the second rollers 68 and thesecond springs 69 may be provided. Each of two opposing side walls ofthe second latch 611 may have the second groove 614 matching with thesecond roller 68. Correspondingly, two opposing side walls of the secondnotch 326 may be recessed away from the corresponding second latch 611to form two second cavities 327. Each of the two second cavities 327 maybe formed to receive one set of the second roller 68 and the secondspring 69.

In some embodiments, the side wall of the second latch 611 may have twosecond grooves 614 at two terminating positions corresponding to thesecond sliding plate 61. For example, one of the two terminatingpositions may be located at an end of the second latch 611 close to thesecond shell 32, and the other one of the two terminating positions maybe located at an intersection between the second latch 611 and thesecond supportive beam 613. When the foldable mobile terminal is in thefolded state and the unfolded state, the second roller 68 mayrespectively enter the second groove 614 of the corresponding one of thetwo terminating positions. Therefore, the user of the foldable mobileterminal may feel a standstill if the foldable mobile terminal is foldedor unfolded to an appropriate position.

Technical features of the above-mentioned embodiments may be combined byany means. To provide a concise description, not all of the possiblecombinations of the technical features are described herein. However, aslong as no contradiction is generated, any combination of the technicalfeatures should be within the scope of the present disclosure.

The above mentioned embodiments may illustrate only some implementationsof the present disclosure. The description may be quite specific anddetailed, but should not be considered to limit the scope of the presentdisclosure. It should be noted that, any ordinary skilled in the art,without departing from the concept of the present disclosure, mayperform various transformation and improvement which should be withinthe scope of the present disclosure. Therefore, the scope of the presentdisclosure shall be subject to the claims.

What is claimed is:
 1. A foldable mobile terminal, comprising: aflexible display screen; a shell assembly, comprising a first shell anda second shell, wherein the flexible display screen is arranged on thefirst shell and the second shell; and a foldable mechanism, comprising:a first rotation assembly, connected to the first shell and comprising:a first sliding plate, at least partially received in the first shelland able to slide towards or away from the first shell; a first rotationshaft, arranged on the first sliding plate; and a first connection rod,wherein a first end of the first connection rod is slidably hinged tothe first rotation shaft, and a second end of the first connection rodis rotatably connected to the first shell; and a second rotationassembly, connected to the second shell and comprising: a second slidingplate, at least partially received in the second shell and able to slidetowards or away from the second shell; a second rotation shaft, arrangedon the second sliding plate; and a second connection rod, wherein afirst end of the second connection rod is slidably hinged to the secondrotation shaft, and a second end of the second connection rod isrotatably connected to the second shell.
 2. The foldable mobile terminalaccording to claim 1, wherein the foldable mechanism further comprises alinkage element connected to the first rotation shaft and the secondrotation shaft; and the linkage element has a first through hole and asecond through hole; the first rotation shaft is arranged to extendthrough the first through hole, and the second rotation shaft isarranged to extend through the second through hole.
 3. The foldablemobile terminal according to claim 1, further comprising a first rollerand a first spring, wherein the first sliding plate has a first groove;the first spring and the first roller abut against both the first shelland the first sliding plate; and when the first sliding plate slidestowards or away from the first shell, the first roller is able to moveinto or out of the first groove.
 4. The foldable mobile terminalaccording to claim 1, further comprising a second roller and a secondspring, wherein the second sliding plate has a second groove; the secondspring and the second roller abut against both the second shell and thesecond sliding plate; and when the second sliding plate slides towardsor away from the second shell, the second roller is able to move into orout of the second groove.
 5. The foldable mobile terminal according toclaim 1, wherein the first rotation assembly further comprises a firstsliding member, the first sliding member slidably sleeves on the firstrotation shaft, and the first end of the first connection rod isrotatably connected to the first sliding member; and the second rotationassembly further comprises a second sliding member, the second slidingmember slidably sleeves on the second rotation shaft, and the first endof the second connection rod is rotatably connected to the secondsliding member.
 6. The foldable mobile terminal according to claim 5,wherein the first rotation assembly further comprises a first supportconnected to the first sliding plate, the first rotation shaft isarranged on the first support, and the first sliding member is arrangedbetween the first support and the first sliding plate; and the secondrotation assembly further comprises a second support connected to thesecond sliding plate, the second rotation shaft is arranged on thesecond support, and the second sliding member is arranged between thesecond support and the second sliding plate.
 7. The foldable mobileterminal according to claim 6, wherein the first rotation assemblyfurther comprises a first elastic sheet arranged inside the firstsupport, the first elastic sheet comprises two first engaging portions,and each of the two first engaging portions corresponds to each of twoextreme positions of the first sliding member; and the second rotationassembly further comprises a second elastic sheet arranged inside thesecond support, the second elastic sheet comprises two second engagingportions, and each of the two second engaging portions corresponds toeach of two extreme positions of the second sliding member.
 8. Thefoldable mobile terminal according to claim 1, wherein the first shellcomprises a first front shell and a first back shell engaged with eachother, the second shell comprises a second front shell and a second backshell engaged with each other, and the flexible display screen isarranged on the first front shell and the second front shell.
 9. Thefoldable mobile terminal according to claim 8, wherein the first frontshell is arranged with a first latch, and the first sliding plate has afirst notch corresponding to the first latch; or the first front shellhas a first notch, and the first sliding plate is arranged with a firstlatch corresponding to the first notch; or the first front shell isarranged with a first latch and has a first notch, the first slidingplate is arranged with a first latch and has a first notch; the firstlatch on the first front shell is in correspondence with the first notchof the first sliding plate, and the first notch of the first front shellis in correspondence with the first latch on the first sliding plate.10. The foldable mobile terminal according to claim 8, wherein thesecond front shell is arranged with a second latch, and the secondsliding plate has a second notch corresponding to the second latch; orthe second front shell has a second notch, and the second sliding plateis arranged with a second latch corresponding to the second notch; orthe second front shell is arranged with a second latch and has a secondnotch, the second sliding plate is arranged with a second latch and hasa second notch; the second latch on the second front shell is incorrespondence with the second notch of the second sliding plate, andthe second notch of the second front shell is in correspondence with thesecond latch on the second sliding plate.
 11. The foldable mobileterminal according to claim 8, further comprising: a joining sheet,crossing over the first sliding plate and the second sliding plate; andtwo pressing elements, wherein each of two ends of the joining sheet isslidably connected to the first front shell and the second front shellthrough a corresponding one of the two pressing elements, and a positionof each of the two pressing elements with respect to the joining sheetchanges during folding and unfolding of the first shell and the secondshell.
 12. The foldable mobile terminal according to claim 8, furthercomprising a first decoration component, disposed at one end of thefirst sliding plate and one end of the second sliding plate andconnected to both the first front shell and the second front shell; anda second decoration component, disposed at the other end of the firstsliding plate and the other end of the second sliding plate andconnected to both the first front shell and the second front shell. 13.The foldable mobile terminal according to claim 1, further comprising asupportive strip, wherein the supportive strip is configured in a gapbetween the first sliding plate and the second sliding plate andconfigured to support the flexible display screen cooperatively with thefirst sliding plate and second sliding plate.
 14. The foldable mobileterminal according to claim 13, wherein a top face of the supportivestrip is facing towards the flexible display screen and is a curvedface.
 15. A foldable mechanism for a foldable mobile terminal; thefoldable mobile terminal comprising a first shell and a second shellconnected to each other; and the foldable mechanism comprising: a firstrotation assembly, capable of being connected to the first shell andcomprising: a first sliding plate, capable of being at least partiallyreceived in the first shell and able to slide towards or away from thefirst shell; a first rotation shaft, arranged on the first slidingplate; and a first connection rod, wherein a first end of the firstconnection rod is slidably hinged to the first rotation shaft, and asecond end of the first connection rod is capable of being rotatablyconnected to the first shell; and a second rotation assembly, capable ofbeing connected to the second shell and comprising: a second slidingplate, capable of being at least partially received in the second shelland able to slide towards or away from the second shell; a secondrotation shaft, arranged on the second sliding plate; and a secondconnection rod, wherein a first end of the second connection rod isslidably hinged to the second rotation shaft, and a second end of thesecond connection rod is capable of being rotatably connected to thesecond shell.
 16. The foldable mechanism for the foldable mobileterminal according to claim 15, wherein the foldable mechanism furthercomprises a linkage element connected to the first rotation shaft andthe second rotation shaft; and the linkage element has a first throughhole and a second through hole; the first rotation shaft is arranged toextend through the first through hole, and the second rotation shaft isarranged to extend through the second through hole.
 17. The foldablemechanism for the foldable mobile terminal according to claim 15,wherein the first rotation assembly further comprises a first slidingmember, the first sliding member slidably sleeves on the first rotationshaft, and the first end of the first connection rod is rotatablyconnected to the first sliding member; and the second rotation assemblyfurther comprises a second sliding member, the second sliding memberslidably sleeves on the second rotation shaft, and the first end of thesecond connection rod is rotatably connected to the second slidingmember.
 18. The foldable mechanism for the foldable mobile terminalaccording to claim 17, wherein the first rotation assembly furthercomprises a first support connected to the first sliding plate, thefirst rotation shaft is arranged on the first support, and the firstsliding member is arranged between the first support and the firstsliding plate; and the second rotation assembly further comprises asecond support connected to the second sliding plate, the secondrotation shaft is arranged on the second support, and the second slidingmember is arranged between the second support and the second slidingplate.
 19. The foldable mechanism for the foldable mobile terminalaccording to claim 17, wherein the first rotation assembly furthercomprises a first elastic sheet arranged inside the first support, thefirst elastic sheet comprises two first engaging portions, and each ofthe two first engaging portions corresponds to each of two extremepositions of the first sliding member; and the second rotation assemblyfurther comprises a second elastic sheet arranged inside the secondsupport, the second elastic sheet comprises two second engagingportions, and each of the two second engaging portions corresponds toeach of two extreme positions of the second sliding member.
 20. Afoldable unit for a foldable mobile terminal, comprising: a first caseand a second case, wherein the first case has a first chamber, and thesecond case has a second chamber; and a foldable mechanism, connected tothe first case and the second case, and comprising: a first substrate,at least partially received in the first chamber and able to slidetowards or away from the first case; a first rotation shaft, arranged onthe first substrate; a first connection rod, wherein a first end of thefirst connection rod is slidably hinged to the first rotation shaft, anda second end of the first connection rod is rotatably connected to thefirst case; a second substrate, at least partially received in thesecond chamber and able to slide towards or away from the second case; asecond rotation shaft, arranged on the second substrate; and a secondconnection rod, wherein a first end of the second connection rod isslidably hinged to the second rotation shaft, and a second end of thesecond connection rod is rotatably connected to the second case.